Show given string is palindrome or not

In this Code Snippet we will know whether given string is palindrome or not.

A palindrome is a word, phrase, number, or other sequence of symbols or elements, whose meaning may be interpreted the same way in either forward or reverse direction. 
Ex:- ana

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim s1 As String
        Dim s2 As String
        s1 = Interaction.InputBox("Enter a string")
        s2 = StrReverse(s1)
        If (s1 = s2) Then
            MessageBox.Show("Given string is palindrome")
        Else
            MessageBox.Show("Given string is not palindrome")
        End If
    End Sub
End Class